package com.example.demo.service.impl;


import com.example.demo.entity.User;
import com.example.demo.repository.UserRepository;
import com.example.demo.service.UserService;
import jakarta.annotation.Resource;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Root;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;


import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Resource
    private UserRepository userRepository;

//    @Override
//    public Page<User> findPageByMap(Map param, Pageable pageable) {
//        return userRepository.findAll(new Specification<User>() {
//            @Override
//            public Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
//                List<Predicate> predicates = new ArrayList<>();
//                if (param.get("usrName") != null){      //动态sql
//                    predicates.add(criteriaBuilder.like(root.get("usrName"),"%"+param.get("usrName")+"%"));
//                }
//                if (param.get("roleId") != null){
//                    predicates.add(criteriaBuilder.equal(root.get("usrRoleId"),param.get("roleId")));
//                }
//                return criteriaBuilder.and(predicates.toArray(new Predicate[predicates.size()]));
//            }
//        },pageable);
//    }
//}
}